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Steps in Using OracleConnectionCacheImpl
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The following sections describe the steps required to instantiate and use the OracleConnection CacheImpl class.
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Instantiating OracleConnectionCacheImpl
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You instantiate an OracleConnectionCacheImpl instance and set its connection properties in one of three ways: Use the OracleConnectionCacheImpl constructor, which takes an existing connection pool data source as input: OracleConnectionCacheImpl occi = new OracleConnectionCacheImpl(cpds); Use the setConnectionPoolDataSource() method on an existing OracleConnection CacheImpl instance, which takes a connection pool data source instance as input: OracleConnectionCacheImpl occi = new OracleConnectionCacheImpl(); occi.setConnectionPoolDataSource(cpds);
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CHAPTER 14 CONNECTION POOLING AND CACHING
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Use the default OracleConnectionCacheImpl constructor and set the properties using the setter methods inherited from the OracleDataSource class: OracleConnectionCacheImpl occi = new OracleConnectionCacheImpl(); occi.setServerName("myserver"); occi.setNetworkProtocol("tcp");
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Setting Pooled Connection Limit Parameters
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The examples in this section assume that occi is an initialized OracleConnectionCacheImpl variable. You can set the minimum number of pooled connections by invoking the setMinLimit() method as follows: occi.setMinLimit( 3 ); The cache will keep three pooled connections open and ready for use at all times. You can set the maximum number of pooled connections by invoking the setMaxLimit() method as follows: occi.setMaxLimit( 10 );
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The cache will have a maximum of ten pooled connections. What happens when you reach the limit and need another connection That depends on the cache scheme you set, as discussed next.
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The OracleConnectionCacheImpl class supports three connection cache schemes that come into effect when all three of the following conditions are true: The application has requested a connection. All existing pooled connections are in use. The maximum limit of pooled connections in the cache has been reached. The three cache schemes are Dynamic: This is the default scheme. In this scheme, the cache would automatically create new pooled connections, though each of these new connections is automatically closed and freed as soon as the logical connection instance that it provided is closed. You can set this scheme using one of the two overloaded versions of the method setCacheScheme(): occi.setCacheScheme( "dynamic" ); occi.setCacheScheme( OracleConnectionCacheImpl.DYNAMIC_SCHEME );
CHAPTER 14 CONNECTION POOLING AND CACHING
Fixed return null: In this scheme, the requests after the maximum limit is exceeded get a null value returned. You can set this scheme using one of the two overloaded versions of the method setCacheScheme(): occi.setCacheScheme( "fixed_return_null_scheme" ); occi.setCacheScheme( OracleConnectionCacheImpl.FIXED_RETURN_NULL_SCHEME ); Fixed wait: In this case, when the maximum limit of pooled connections is reached, the next request would wait forever. You can set this scheme using one of the two overloaded versions of the method setCacheScheme(): occi.setCacheScheme( "fixed_wait_scheme" ); occi.setCacheScheme( OracleConnectionCacheImpl.FIXED_WAIT_SCHEME );
Setting Oracle Connection Cache Timeouts
Applications can also time out the physical and logical connections. Oracle JDBC drivers provide following three types of timeout periods for this purpose: Wait timeout: The maximum period after which a physical connection is returned to the cache. This wait triggers only when all connections are in use and a new connection is requested. A timeout exception, EOJ_FIXED_WAIT_TIMEOUT, is thrown when the timeout expires. You use the getter and setter methods on the property CacheFixedWait Timeout to get and set this timeout. Inactivity timeout: The maximum period a physical connection can remain unused. When the period expires, the connection is closed and its resources are freed. You use the getter and setter methods on the property CacheInactivityTimeout to get and set this timeout. Time to live timeout: The maximum period a logical connection can be active. After this time expires, whether or not the connection is still in use, the connection is closed and its resources are freed. You use the getter and setter methods on the property CacheTimeToLiveTimeout to get and set this timeout.
Example of Using OracleConnectionCacheImpl
The following DemoOracleConnectionCache class illustrates how to use Oracle connection caching by using the dynamic and fixed return null cache schemes. We begin with the imports and the class declaration, followed by the main() method: /* This program demonstrates how to use Oracle connection cache. * COMPATIBLITY NOTE: runs successfully against 9.2.0.1.0 and 10.1.0.2.0 */ import java.sql.Connection; import java.sql.SQLException; import oracle.jdbc.pool.OracleConnectionCacheImpl; import book.ch03.JDBCUtil;
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